991634154 has 32 divisors (see below), whose sum is σ = 2267951616. Its totient is φ = 283154160.

The previous prime is 991634141. The next prime is 991634197. The reversal of 991634154 is 451436199.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74989 + ... + 87215.

It is an arithmetic number, because the mean of its divisors is an integer number (70873488).

Almost surely, 2^991634154 is an apocalyptic number.

991634154 is an abundant number, since it is smaller than the sum of its proper divisors (1276317462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991634154 is a wasteful number, since it uses less digits than its factorization.

991634154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14170.

The product of its digits is 116640, while the sum is 42.

The square root of 991634154 is about 31490.2231494158. The cubic root of 991634154 is about 997.2035719462.

The spelling of 991634154 in words is "nine hundred ninety-one million, six hundred thirty-four thousand, one hundred fifty-four".